2023 - Monster Mountain Entry Lists - 250cc
| Name | Rider No | Sponsor | Team | Hometown | Manufacturer |
| Liam Bennett | 5 | GMR\MAGIC MUSHROOM\APICOLEATT\HUSK | Essex | HUS | |
| Finley Evans | 12 | GRT IMPACT KTM | GRT IMPACT KTM | Somerset | KTM |
| Sydney Putnam | 19 | SC SPORTHOMES HUSQVARNA | SC SPORTHOMES HUSQVARNA | Buckinghamshire | HUS |
| Jak Taylor | 22 | MONSTER MOUNTAIN\ABSOLUTE APICO LEA | Mid Glamorgan | HUS | |
| Seth Manners | 42 | ARNCOTT MOTO PARK | Oxfordshire | HUS | |
| Tye Jones | 221G | DYNAMIC AIR | Buckinghamshire | HUS | |
| Billy Askew | 441 | GTCI REVO KAWASAKI | GTCI Revo Kawasaki | Lincolnshire | KAW |
| Mckenzie Marshall | 555 | DK OFFROAD\FXR\ELITECOACHWORKS | Staffordshire | YAM | |
| Joel Fisher | 711 | AD MODULAR\BEER TRADER | Cheshire | KTM |